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## Index: E

e (constant): 9.1.1. Trigonometric Functions
-e option (sed): 2.3.1. Specifying Simple Instructions
  2.3.2.3. Mixing options (POSIX)
ed editor: 2. Understanding Basic Operations
edits, pipelined: 4.4.4. Edits To Go
egrep program: 3. Understanding Regular Expression Syntax
else statements (see if statements)
end
  of line (see $ (dollar sign))
  of word (see <, > escape sequences)
END procedure: 11.1.6. Control Flow
ENDFILE procedure (tawk): 11.3.2.1. Tawk language extensions
"Ending delimiter missing" error: 2.3.1.1. Command garbled
ENVIRON variable: 8.6. System Variables That Are Arrays
  8.6.2. An Array of Environment Variables
environment variables: 8.6.2. An Array of Environment Variables
equal sign (=)
  == (equal to) operator: 7.8. Relational and Boolean Operators
  for printing line numbers: 5.9. Print Line Number
equivalence classes: 3.2.4.3. POSIX character class additions
EREs (extended regular expressions): 3.2.4.3. POSIX character class additions
ERRNO variable (gawk): 11.2.3.8. Additional variables
error messages: 11.2.1.4. Special filenames
  12.3.4. A Function for Reporting Errors
  awk: 2.4.2. Error Messages
  "command garbled": 2.3.1.1. Command garbled
    5.1. About the Syntax of sed Commands
  sed: 2.3.1.1. Command garbled
errors
  debugging: 10.7. Debugging
  spelling, finding (example): 12.1. An Interactive Spelling Checker
ESC character in vi: 5.6. List
escape sequences, awk: 7.6. Expressions
  11.1.1. Escape Sequences
  B.2.5.2. Escape sequences
escaping (see backslash)
example programs: 0.. Sample Programs
exchange command (see x command (sed))
exclamation point (!): 4.2. A Global Perspective on Addressing
  csh and: 1.4. Four Hurdles to Mastering sed and awk
  != (not equal to) operator: 7.8. Relational and Boolean Operators
  !~ (does not match) operator: 7.5.1. Referencing and Separating Fields
    7.8. Relational and Boolean Operators
    7.8. Relational and Boolean Operators
  logical NOT operator: 7.8. Relational and Boolean Operators
  tilde (~) operator: 7.5.1. Referencing and Separating Fields
exit statement: 8.3. Other Statements That Affect Flow Control
exp( ): 9.1.1. Trigonometric Functions
exponentiation: 7.6. Expressions
  9.1.1. Trigonometric Functions
  11.1.2. Exponentiation
  ** operator: 7.6. Expressions
  ^ operator: 7.6. Expressions
expressions: 3.1. That's an Expression
  B.2.5. Expressions
  awk: 7.6. Expressions
  executing as commands: 10.3. The system( ) Function
  regular (see regular expressions)
extended regular expressions (EREs): 3.2.4.3. POSIX character class additions
extensions
  common awk: 11.2.1. Common Extensions
  gawk: 11.2.3. GNU awk (gawk)
  mawk: 11.2.4. Michael's awk (mawk)
  tawk: 11.3.2. Thompson Automation awk (tawk)
extent of matching: 3.2.12.1. The extent of the match
extracting file contents: 4.4.3. Extracting Contents of a File

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